So, searching, I've not found anything that already addresses this.
I have the X64 flavor of LibreELEC (10.0.0.3 Matrix) running on a Chromebox. This is connected to an HDMI splitter (and audio extractor), in turn feeding an AVR and projector.
Whichever device that is plugged in the "first" HDMI output port of the splitter is what is detected in the System/Settings as the audio device.. I currently have my AVR plugged in to that port, so that's what's reported as HDMI0: "AVR"
What's odd is that if the projector (on the second port, not detected by LibreELEC), I get no sound from the AVR connected via HDMI. If I power the projector off... I get audio.
Swapping ports (and the projector thus being detected on HDMI0) likewise renders no sound routed to the AVR, as I would have expected. in both cases I get video on both output ports.
So... any thoughts as to why even thought the AVR is what is being detected, the mere presence of the projector on the other (non-detected) port screws this up? The projector actually does have audio capabilty (RCA jacks), so my guess is that for some reason audio is being routed there regardless...
The previous 2 devices connected to the same splitter (both Windows PC's) had no such issue, so I know the devices are capable of it....
Thanks.